Stone-channeling machine



(No Model.) 3 Sheets-Sheet 1.

T. MGDONNELL, Jr.

sToNE GHANNELING MACHINE.

No. 391,260. I Patented Oot. 16, 1888.

w! me@ w (No Model.) 3 Sheets-Sheet 2. T. MGDONNELL, Jr.

STONE GHANNBLING MACHINE. No. 391,260. Patented Oct. 16, 1888.

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(No Model.) Y 3 Sheets-Sheet 3.

T. MGDONNELL, Jr.

STONE GHANNELING MAGHIE.

No. 391,260. Patented Oct. 16, 1888.

N. PETERS, PhnwLimugmphnr. wadnngmn, D4 a UNITED STATES PATENT OFFICE.

THOMAS MCDONNELL, JR., OF COCKEYSVILLE, MARYLAND.

STON-CHANNELING MACHINE.

SPECIFICATION forming part of Letters Patent No. 391,260, dated October I6, 1888.

(No model.)

To all whom L' may concern:

Be it known that l, Tiroriss MeDoNNELL, Jr. a citizen of the United States, residing at Cockeysville, in the county of Baltimore and State of Maryland, have invented certain new and useful Improvementsin Stone- Channeling Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the saine.

My invention relates to a new and useful improvement in stone-channeling machines; and it consists in the construction and arrangement ofparts,more fullyhereinafter described, and pointed out in the claims.

The object of my invention is to provide a stone channeling machine which shall be constructed in such a manner as to prevent the action of the drills from jarring` the frame and drill-operating portion of the machinery, thereby preventing damage, and still allow the same to be positive and effective in their working.

A further obj eet consists in the arrangement ofthe drill-lifting mechanism in such a manner as to prevent the wrenching or breakage of the machineor drills when thelatter become so wedged in the channel that the machine is unable to extract the same without damage ensuing.

A further object consists in providing a Vstone-channeling machine of the kind hereinafter described with suitable machinery whereby the drills may be removed after the completion ofthe work or placed into position when the same is commenced.

These objects are obtained by the construetion illustrated in the accompanying drawings, wherein like letters of reference indicate corresponding parts in the several views, and in which- Figure 1 is a front elevation of my improved machine. Fig. 2 is a side elevation of the same. Fig. 3 is an enlarged detail view of the lifting mechanism; Fig. 1, a detail view showing the inner serrated face of one of the retaining-clamps; and Fig. 5 isa modification of the lifting mechanism.

In the drawings, A represents the frame, provided on its under side with suit-able trucks, c c, constructed to run upon tracks, (not shown,) to allow of the frame being moved forward or backward, as necessity may require. Upon the upper side of said frame is provided supports a a', which have suitable bearings formed in their upper ends, in which the horizontal crankshaft B works.

C G indicate the vertical standardguides, the lower ends thereof being bent in and secured to the frame at a point adjacent to the supports a a. The upper ends of said guides are connected by a braeebar, C. On the vertical guides C C are placed sliding blocks D and D', the latter being of greater width than the former and located beneath the same. Said blocks traverse the front of the vertical guides and have recesses d d formed in their outer faces of a depth equal to the thickness of the drills E. The width of these is sufficient to permit a gang of drills to be placed therein and a tightening or binding wedge, d, to be inserted between the sides of the last drill and the ilange formed by the edge of the block.

The construction of the elampingblocks D and D and the arrangement and construction of the drills in said blocks are more fully illustrated in Fig. 3 of the drawings, in which the drills are shown as clamped and held in position within said blocks. To retain the drills in their adjusted position and to prevent vertical movement of the same, I form upon the outer faces thereof, above the blades or points, a series of inclined or diagonally-arranged serrations or ridges,which mesh vor interlock with corresponding serrations formed in the inner faces of the clamping-plates F F', so that the latter, when bolted or secured to the bloeks,wili be closely interlocked with the seri-ations of the drills, thereby tightly packing the same within the blocks. It will be observed that as the impact of the drills,when the machine is in operation,has a tendency to cause the vertical movement ofthe clamps,as well as to loosen the drills from their adjusted postioml am, by providing the outer faces of the drills and inner faces ofthe clamping-plates with inclined serrations,enabled to overcome this defect, for the inclined serrations, instead of allowing a vertical movement of the drills, force the same against the sides of the sliding blocks, and thus bind the same in place, at the same time relieving theA clanijriingvplates from a great amount of .of the standardguides.

strain which they otherwise would be subjected to. It is therefore obvious that the greater the im pactof the drills when the same, together with the clamping-plates, arepro,- vided with inclined serrations the tighter will be the binding thereof.

I am aware that it is not broadly new to provide the clamping-'plates and drills with serrations for the purpose of enabling the same to mesh with one another, for this is shown in Patents Nos. 40,584 and 105,391; but the difference between these and my clampingplate is in the construction of the same. In the above patents the serrations are horizontal, which makes the same subject to the defects hereinbefore described, and which the plates herein shown are designed to obviate, while I provide the drills and clamping-plates with diagonal serrations for thepurpos'es above stated.

I do not claim,'broadl y, clamping-plates provided with serrations meshing with like serrations formed upon the drills, but with diagonal serrations meshing with similar ones formed upon the drills.

In machines of this class it is usual to allow the weight of the drills and clamping-blocks to give the necessary downward force to the drills. Whilethis would auswenprovided the stone to be worked was directly beneath the machine, it would fail if it should become necessary to channel at an angle. To overcome this latter objection, as well as to add greater cutting force to the drills'when in an upright position, I preferably secure spiral springs e to the upper ends of the lower blocks, D', and the upper ends I connect to the blocks 0,which blocks have recesses formed in their top in which the rods o fit. These rods have their upper portion screw-threaded and are screwed into the blocks o, connected to the inner face I am enabled by the screwing or unscrewing of this rod to tighten or loosen the springs e, thereby increasing or decreasing the downward impetus of the drills. Vhen the drills are raised,the springs will be compressed, and when released from their elevated position the springs Will greatly add to their downward impetus. To raise the drills, I employ a horizontal crank-shaft, B, above referred to, which is rotated by having direct ycommunication with the piston ofthe engine, which is preferably located on the rear part of the frame, and which, forming no part of my invention, need not herein be described, merely mentioning the fact that I employ the same to give forward or backward movement to the trucks above referred to, as well as to work the horizontal shaft. The ends of the horizontal shaft have rigidly secured thereon circular disks B', which have wristpins b placed eccentrically thereon. J ournaled on the wrist-pins b are square head-blocks G, having a slot formed vertically therethrough, in which are placed and operated pitmen H, pivotally connected to the sides of the blocks D. The upper or protruding ends of the pitmen I-I have removable caps hthereon,against which the upper ends of the spiral cushionsprings J, surrounding the upper ends of the pitmen, impinge, their lower ends resting on the top of the blocks G. The pitmen H are of sufficient height to allow of a complete revolution of the disk B without raising the drills; but by the interposition ofthe springs J, which have the required resiliency to withstand the weight of the drills without compression, or with very little, the said drills are raised as the headblocks are carried up by the wrist-pins during the revolution of the disks. The downward movement of the drills is caused by the relaxation of the springs e, together with the weight of the blocks and drills. Of course the springs J are heavier than the springs e, so as to allow the latter to be compressed, while the former is very little compressed, if at all. The springs J', situated below the block G', surrounding the pitman, and having their lower ends resting upon the collar formed upon the pitman, serve to relieve the frame and ngine from the jarring occasioned by the operation of the drills.

In Fig. 5 I have illustrated a modified form of my improved drill-lifting mechanism, which consists in securing to a plate, p, formed upon the standard-guides, the upper ends of spiral springs a u', their lower ends being connected to the block D. Vhen this form of connection is desired, the pitmen H are dispensed with, as well as all parts connected therewith, and motion is given to the drills by bringing the wrist-pins formed upon the disk in direct contact with the under face of the blocks D', but I prefer to use the connection previously described, as I believe the same to be more effective in its operation.

I have shown in Fig. l of the drawings the brace-bar C provided at or about midway between the two standardsguides with a swinging crane secured thereto. The standard por- IOC.

tion of said crane is made hollow and provided upon its top with a pulley, Z', and upon the upper face of the extended arm thereof with pulley Z. The object of this crane is to allow of quickly removing the drills from their position upon the completion of the work or to place the same in position upon commencement thereof, as the same are too heavy to permit of their handling by the workmen. Io accomplish either of these objects, the crane is swung around until the pulleyZ hangs over the gang of drills. A rope, chain, or cable is then secured at some point to the drills, and then passes over the pulley Z and pulley Z', down through the hollow standard portion of the crane, through an aperture formed in the brace-bar, and is then secured to a drum situated below the frame, which drum may either be turned by the engine or by hand. Upon the removal of one gang of drills the crane may be swung over to the other side, so as to permit the removal of the other gang,

The operation of my machine is as follows: As the shaft B is rotated by the piston of the engine, the disks B' are revolved, which, as the wrist-pins are placed eccentrically thereon and secured to the head-blocks G, necessarily raises the same, which in turn raises the drills through the pitman II, attached to the clamp-blocks D'. As the disks continue to revolve, the headblocks are lowered and the drills forced into their work by gravity, the action of the springs e and the downward movement of the wristpins thus forming a positive action for the drills. Should the drills at any time become clogged or wedged in the channels, the sudden stoppage of the samewould prevent the revolution of the shaft B and great damage ensue by breakage either to the drills, connections, shafts, or engine. To overcome this defeet, I provide,as previously stated, the springs J, which are of sufficient strength to raise the drills without compression or very slight compression; but on the occurrence of the wedging of the drills they will be brought into use and allow the machinery still to continue working, without damage being done to the drills or other portion of the machinery, also allowing a gang of drills so wedged to remain nonworking until relieved, while the other set still continues its work.

It is obvious that many minor changes may be made in the construction and arrangement yof the parts of my improved machine without departing from the nature and principle of my invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is-

1. In a stone channeling machine, the combination, with the frame and the standardguides, of the crank-shaft having disks thereon, wrist-pins eceentrically arranged upon said disks, head-blocks connected to said wristpins, pitmen sliding within the head-blocks, and drills, substantially as herein shownA and described.

2. In a stone-channeling machine, the combination, with the horizontal shaft having disks upon the outer ends thereof, wrist-pins formed upon said disks, of the head-blocks engaging with said wrist-pins and having slots therein through which the pitmen work, and the sliding blocks for raising and lowering the drills, substantially as herein shown and described.

3. In a stone-channeling machine of the kind herein shown and described, the combination, with the engine, piston, shaft, disks having wrist-pins formed thereon, and the head-blocks working upon said wrist-pins, of the pitmen having movable collars upon their upper ends and lower port-ions thereof, and spiral springs interposed on the pitmen between said collars and the head-blocks in connection with the sliding blocks, substantially as and for the purpose set forth.

4. In a stonechanneling machine, the combination, with the drill-clamps and the disks, of the head-blocks mounted on said disks, the pitmen working in said head-blocks, and spiral springs arranged on the pitmen above and below the head-blocks, substantially as herein shown and described.

5. In a stone channeling machine, in combination with the drill-lifting mechanism, the sliding blocks D' and D, having their outer faces recessed to receive a gang of drills, the drills having diagonal serrations on their outer faces, and the drillclamping plates having inner diagonal serrations meshing with the serrations on the drills, thereby holding the latter in a rigid position, said clamping-plates being bolted to the sliding blocks, substantially as herein shown and described.

6. In a stone-channeling machine,the combination, with the lifting mechanism herein described, of the means for adding impetus to the downward movement of the drills, consisting of the springs e, connected at their lower ends with the head-blocks D and at their upper ends with the blocks o', in connection with the retaining-rod o, substantially as and for the purpose set forth.

7. In a stone-channeling machine, the combination, with the machinery herein described, of the screw-threaded rod o, working in the block o", standard-guides C, recessed blocks o", springs e, sliding blocks D', and drills, as and for the purpose herein set forth.

S. In a stone-channeling machine, the cornbination of the frame A, shaft B, having disks B', the wrist-pins'b, eccentrically secured on said disks, the head blocks G, pitmen H, sliding clamps D and D', drills supported in said clamps, the springs J', J', and e, and the standardguides,substantially as herein shown, and for the purpose described.

In testimony whereof I affix my signature in presence of two witnesses.

'.IHOS. MCDONNELL, JR.

Vitnesses:

ROBINSON WHITE, N. A. AoKER.

ICO 

